1	Leaves entire, margin sparsely serrate	P. alepidioides
–	Leaves pinnate or pinnatifid	2
2	Stems reduced, sometimes acaulescent	3
–	Stems developed	5
3	Bracteoles margin membranous	P. nana
–	Bracteoles margin purplish	4
4	Fruits ovoid, with slightly cordate base; ribs prominent, with small warts	P. shaniana
–	Fruits broadly ovoid; ribs prominent and sinuate, with sparse minute warts	P. kingdon-wardii
5	Nerves of leaves purple-red	P. rubrinervis
–	Nerves of leaves green	6
6	Bracts lanceolate or oblong; ribs filiform	P. delavayi
–	Bracts leaf-like; ribs prominent	7
7	Bracteoles ovate-lanceolate,entire; ribs with scattered warts	P. muliensis
–	Bracteoles ovate-oblong; ribs with narrowly winged, sinuolate	P. obtusiuscula